Hi, I know this is an old post, but I have been diagramming sentences with my son. I always thought it was really hard to do and a chore, but since I am homeschooling my son and he isn't forced to do it, he is actually interested and finds it fun. If you could give me an example of such sentence, then I could diagram it for you. We are using this curriculum for grammar - Royal Fireworks Press by Michael Clay Thompson http://www.rfwp.com/series/grammar-elementary-program-by-michael-clay-thompson#book-grammar-island There is a workbook that has the correct answers. I am really happy to learn or relearn this for myself. Best, Jennifer